TY - JOUR
T1 - Impaired insulin sensitivity is accompanied by disturbances in skeletal muscle fatty acid handling in subjects with impaired glucose metabolism.
AU - Moors, C.C.M.
AU - van der Zijl, N.J.
AU - Diamant, M.
AU - Blaak, E.E.
AU - Goossens, G.H.
PY - 2012/1/1
Y1 - 2012/1/1
N2 - Objective:To determine insulin sensitivity and skeletal muscle fatty acid (FA) handling at baseline and after a high-fat mixed meal in impaired fasting glucose (IFG), impaired glucose tolerance (IGT), IFG/IGT and normal glucose tolerance (NGT) subjects.Design:In this multi-center study, insulin sensitivity and beta-cell function were assessed (n=102), using a euglycemic-hyperinsulinemic and hyperglycemic clamp with additional arginine stimulation and a 75 g oral glucose tolerance test. Fasting and postprandial skeletal muscle FA handling was examined in a substudy using the forearm balance technique (n=35).Subjects:A total of 102 subjects with IFG (n=48), IGT (n=12), IFG/IGT (n=26) and NGT (n=16).Results:IFG, IGT and IFG/IGT subjects had lower insulin sensitivity with no differences between groups, and lower impaired beta-cell function compared with NGT controls. The early postprandial increase in triacylglycerol (TAG) concentration was higher (iAUC(0-2 h) IFG: 238.4+/-26.5, IGT: 234.0+/-41.0 and NGT: 82.6+/-13.8 mumol l(-1) min(-1), both P<0.05) and early TAG extraction was increased (AUC(0-2 h) IFG: 56.8+/-9.0, IGT: 52.2+/-12.0 and NGT: 3.8+/-15.4 nmol.100 ml(-1) min(-1), P<0.05 and P=0.057, respectively) in both IFG and IGT subjects.Conclusion:IFG, IGT and IFG/IGT subjects have lower insulin sensitivity and impaired beta-cell function compared with age- and BMI-matched NGT controls. The increased postprandial TAG response and higher muscle TAG extraction in both IFG and IGT compared with NGT may lead to ectopic fat accumulation in the skeletal muscle, thereby contributing to insulin resistance.International Journal of Obesity advance online publication, 28 June 2011; doi:10.1038/ijo.2011.123.
AB - Objective:To determine insulin sensitivity and skeletal muscle fatty acid (FA) handling at baseline and after a high-fat mixed meal in impaired fasting glucose (IFG), impaired glucose tolerance (IGT), IFG/IGT and normal glucose tolerance (NGT) subjects.Design:In this multi-center study, insulin sensitivity and beta-cell function were assessed (n=102), using a euglycemic-hyperinsulinemic and hyperglycemic clamp with additional arginine stimulation and a 75 g oral glucose tolerance test. Fasting and postprandial skeletal muscle FA handling was examined in a substudy using the forearm balance technique (n=35).Subjects:A total of 102 subjects with IFG (n=48), IGT (n=12), IFG/IGT (n=26) and NGT (n=16).Results:IFG, IGT and IFG/IGT subjects had lower insulin sensitivity with no differences between groups, and lower impaired beta-cell function compared with NGT controls. The early postprandial increase in triacylglycerol (TAG) concentration was higher (iAUC(0-2 h) IFG: 238.4+/-26.5, IGT: 234.0+/-41.0 and NGT: 82.6+/-13.8 mumol l(-1) min(-1), both P<0.05) and early TAG extraction was increased (AUC(0-2 h) IFG: 56.8+/-9.0, IGT: 52.2+/-12.0 and NGT: 3.8+/-15.4 nmol.100 ml(-1) min(-1), P<0.05 and P=0.057, respectively) in both IFG and IGT subjects.Conclusion:IFG, IGT and IFG/IGT subjects have lower insulin sensitivity and impaired beta-cell function compared with age- and BMI-matched NGT controls. The increased postprandial TAG response and higher muscle TAG extraction in both IFG and IGT compared with NGT may lead to ectopic fat accumulation in the skeletal muscle, thereby contributing to insulin resistance.International Journal of Obesity advance online publication, 28 June 2011; doi:10.1038/ijo.2011.123.
U2 - 10.1038/ijo.2011.123
DO - 10.1038/ijo.2011.123
M3 - Article
C2 - 21712806
SN - 0307-0565
VL - 36
SP - 709
EP - 717
JO - International Journal of Obesity
JF - International Journal of Obesity
IS - 5
ER -